When meshing with the Coopet tool, the Gambit online manual have an example on how to mesh a combination of a cylinder, a box and a "corner". The operation is divided in 4 steps. Step no.2 is an imprint of the source faces onto each other.

My question is how this imprint is done. Is it done just by selecting the source faces or is there a special command that should be used (if yes: there is this command; I cannot find it).